The Open Door Web Site
HOME PAGE BIOLOGY CHEMISTRY PHYSICS ELECTRONICS HISTORY HISTORY of SCI & TECH MATH STUDIES LEARN FRENCH STUDY GUIDE PHOTO GALLERY
ATOMIC and NUCLEAR ELECTRICITY and MAGNETISM MEASUREMENTS MECHANICS OPTICS PRACTICAL WORK QUESTIONS RELATIVITY THERMAL PHYSICS WAVES
PRACTICAL WORK
Google
Custom Search
Electricity and Magnetism
Aim: to measure the Internal Resistance of a Battery
The final result will be taken from a graph showing the electrical characteristics of the battery.
See Observing the effects of the internal resistance of a batteryThe Internal Resistance of a battery
 
Method
In the following circuit a bulb is included simply to limit the maximum current.
The internal resistance of a battery is not constant but increases as the battery is used.
For this reason do not leave the circuit connected longer than is necessary to take the readings.
It's also probably easiest to measure the internal resistance of a new battery (or a recently charged battery if you are investigating rechargeable batteries).
 
Most electrical characteristics are plotted with V horizontal and I vertical.
This ia based on the logic that the potential difference causes the current to flow (so potential difference independent variable and current dependent variable).
However, it is reasonable to suggest that the terminal potential difference of the battery depends on the current we take from it thus we usually plot battery characteristics with I horizontal and V vertical.
The equation relating I and V is
This is the equation of a straight line of slope -r so we expect a graph looking something like this:
 
SITE MAP
WHAT'S NEW
ABOUT
PRIVACY
COPYRIGHT
SPONSORSHIP
DONATIONS
ADVERTISING
 

© The Open Door Team
2016
Any questions or
problems regarding
this site should be
addressed to
the webmaster

David Hoult 2017

Hosted By
Web Hosting by HostCentric

 
SiteLock
 
 
Practicals Index Page